The National Library of Israel has completed the restoration of the 15th Century Moskowitz Mahzor and has been put online for the first time. The manuscript was written on parchment by Joel ben Simeon, considered by many to be the most important Jewish artist of the Middle Ages.
https://www.nli.org.il/he/manuscripts/NNL_ALEPH000044866/NLI?volumeItem=3#$FL91794051